going alone in the dark late at night, hights (where I don't have any security), to get a papercut, cats who suddently jumps out of the dark, sounds at a graveyard when it's dark, that someone is destroying my gaming stats while I am gone +++

Genetically modified foods, animals and/or virus and bacteria with the possibility of irreversibly changing or destroying the natural order of life on the planet and the unforeseen (or perhaps planned) consequences this has/will have on the human population after decades of exposure.